Ecosystem health of the Great Barrier Reef: Time for effective management action based on evidence

Abstract The Great Barrier Reef (GBR) is a World Heritage site off the north-eastern coast of Australia. The GBR is worth A$ 15–20 billion/year to the Australian economy and provides approximately 64,000 full time jobs. Many of the species and ecosystems of the GBR are in poor condition and continue to decline. The principal causes of the decline are catchment pollutant runoff associated with agricultural and urban land uses, climate change impacts and the effects of fishing. Many important ecosystems of the GBR region are not included inside the boundaries of the World Heritage Area. The current management regime for catchment pollutant runoff and climate change is clearly inadequate to prevent further decline. We propose a refocus of management on a “Greater GBR” (containing not only the major ecosystems and species of the GBR, but also its catchment) and on a set of management actions to halt the decline of the GBR. Proposed actions include: (1) Strengthen management in the areas of the Greater GBR where ecosystems are in good condition, with Torres Strait, northern Cape York and Hervey Bay being the systems with highest current integrity; (2) Investigate methods of cross-boundary management to achieve simultaneous cost-effective terrestrial, freshwater and marine ecosystem protection in the Greater GBR; (3) Develop a detailed, comprehensive, costed water quality management plan for the Greater GBR; (4) Use the Great Barrier Reef Marine Park Act and the Environment Protection and Biodiversity Conservation Act to regulate catchment activities that lead to damage to the Greater GBR, in conjunction with the relevant Queensland legislation; (5) Fund catchment and coastal management to the required level to solve pollution issues for the Greater GBR by 2025, before climate change impacts on Greater GBR ecosystems become overwhelming; (6) Continue enforcement of the zoning plan; (7) Australia to show commitment to protecting the Greater GBR through greenhouse gas emissions control, at a scale relevant to protecting the GBR, by 2025.

[1]  Jon Brodie,et al.  Are increased nutrient inputs responsible for more outbreaks of crown-of-thorns starfish? An appraisal of the evidence. , 2005, Marine pollution bulletin.

[2]  G. Holland,et al.  Tropical cyclones and climate change , 2010, Tropical Cyclone Research and Review.

[3]  Eduardo Teixeira da Silva,et al.  Extreme weather conditions in the Great Barrier Reef: drivers of change? , 2012 .

[4]  J. Day,et al.  Effective governance of a large and complex cross-jurisdictional marine protected area: Australia's Great Barrier Reef , 2013 .

[5]  Caroline Petus,et al.  Using MODIS data for understanding changes in seagrass meadow health: a case study in the Great Barrier Reef (Australia). , 2014, Marine environmental research.

[6]  H. Sweatman No-take reserves protect coral reefs from predatory starfish , 2008, Current Biology.

[7]  William J. Skirving,et al.  A comparison of the 1998 and 2002 coral bleaching events on the Great Barrier Reef: spatial correlation, patterns, and predictions , 2004, Coral Reefs.

[8]  R. Kenchington,et al.  Zoning, a fundamental cornerstone of effective Marine Spatial Planning: lessons learnt from the Great Barrier Reef, Australia , 2011 .

[9]  G. Hegerl,et al.  Human contribution to more-intense precipitation extremes , 2011, Nature.

[10]  S. Carpenter,et al.  Creating a safe operating space for iconic ecosystems , 2015, Science.

[11]  Camille Mellin,et al.  Marine protected areas increase resilience among coral reef communities. , 2016, Ecology letters.

[12]  F. Kroon,et al.  Towards protecting the Great Barrier Reef from land‐based pollution , 2016, Global change biology.

[13]  M. McCulloch,et al.  Long-term records of coral calcification across the central Great Barrier Reef: assessing the impacts of river runoff and climate change , 2013, Coral Reefs.

[14]  S. Delean,et al.  Assessing loss of coral cover on Australia’s Great Barrier Reef over two decades, with implications for longer-term trends , 2011, Coral Reefs.

[15]  J. Brodie,et al.  Quantifying the sources of pollutants in the Great Barrier Reef catchments and the relative risk to reef ecosystems. , 2012, Marine pollution bulletin.

[16]  C. Wild,et al.  Interactive climate change and runoff effects alter O-2 fluxes and bacterial community composition of coastal biofilms from the Great Barrier Reef , 2012 .

[17]  R. Pressey,et al.  Guiding principles for the improved governance of port and shipping impacts in the Great Barrier Reef. , 2013, Marine pollution bulletin.

[18]  R. Costanza,et al.  A new approach to the problem of overlapping values: A case study in Australia's Great Barrier Reef , 2014 .

[19]  R. Evans,et al.  Habitat dynamics, marine reserve status, and the decline and recovery of coral reef fish communities , 2014, Ecology and evolution.

[20]  M. Witt,et al.  Coastal Conservation: The impacts of climate change on marine turtle reproductive success , 2014 .

[21]  Scarla J. Weeks,et al.  The effects of river run-off on water clarity across the central Great Barrier Reef. , 2014, Marine pollution bulletin.

[22]  Glenn De'ath,et al.  Declining Coral Calcification on the Great Barrier Reef , 2009, Science.

[23]  Eduardo Teixeira da Silva,et al.  Assessment of the relative risk of water quality to ecosystems of the Great Barrier Reef. , 2013 .

[24]  P. Donaghy,et al.  Targeting resource investments to achieve sediment reduction and improved Great Barrier Reef health , 2013 .

[25]  Caroline Petus,et al.  Effects of reduced water quality on coral reefs in and out of no‐take marine reserves , 2016, Conservation biology : the journal of the Society for Conservation Biology.

[26]  Sean R Connolly,et al.  Evidence for multiple stressor interactions and effects on coral reefs , 2014, Global change biology.

[27]  Iliana Chollett,et al.  Operationalizing the Resilience of Coral Reefs in an Era of Climate Change , 2014 .

[28]  G. Brundtland,et al.  Our common future , 1987 .

[29]  T. Hughes,et al.  Securing the future of the Great Barrier Reef , 2015 .

[30]  Murray Logan,et al.  Expectations and Outcomes of Reserve Network Performance following Re-zoning of the Great Barrier Reef Marine Park , 2015, Current Biology.

[31]  Graeme J. Doole,et al.  Construction of a Bio-economic Model to Estimate the Feasibility and Cost of Achieving Water Quality Targets in the Burnett-Mary Region, Queensland , 2015, ISESS.

[32]  William J. Sutherland,et al.  Bird Ecology and Conservation , 2004 .

[33]  J. Watson,et al.  The performance and potential of protected areas , 2014, Nature.

[34]  G. Reichart,et al.  Australian tropical cyclone activity lower than at any time over the past 550–1,500 years , 2014, Nature.

[35]  G. De’ath,et al.  Three lines of evidence to link outbreaks of the crown-of-thorns seastar Acanthaster planci to the release of larval food limitation , 2010, Coral Reefs.

[36]  J. Brodie Dredging the Great Barrier Reef: Use and misuse of science , 2014 .

[37]  David J. Williams,et al.  A process to design a network of marine no-take areas: Lessons from the Great Barrier Reef , 2009 .

[38]  Rob Coles,et al.  An ecosystem‐scale predictive model of coastal seagrass distribution , 2010 .

[39]  James K. Sheppard,et al.  Informing Species Conservation at Multiple Scales Using Data Collected for Marine Mammal Stock Assessments , 2011, PloS one.

[40]  Scott F. Heron,et al.  Climate change disables coral bleaching protection on the Great Barrier Reef , 2016, Science.

[41]  M. Rasheed,et al.  Long-term climate-associated dynamics of a tropical seagrass meadow: implications for the future , 2011 .

[42]  Jon Brodie,et al.  A critical review of environmental management of the 'not so Great' Barrier Reef , 2012 .

[43]  B. Willis,et al.  Seasonal Rainfall and Runoff Promote Coral Disease on an Inshore Reef , 2011, PloS one.

[44]  Robert Costanza,et al.  The economic value of ecosystem services in the Great Barrier Reef: our state of knowledge , 2011, Annals of the New York Academy of Sciences.

[45]  R. Steneck,et al.  Coral Reefs Under Rapid Climate Change and Ocean Acidification , 2007, Science.

[46]  J. Brodie,et al.  Review and conceptual models of agricultural impacts and water quality in waterways of the Great Barrier Reef catchment area , 2017 .

[47]  J. Brodie,et al.  Catchment management and the Great Barrier Reef. , 2001, Water science and technology : a journal of the International Association on Water Pollution Research.

[48]  Re-evaluation of the sustainability of a marine mammal harvest by indigenous people using several lines of evidence , 2015 .

[49]  R. Seymour,et al.  Alternative stable states and phase shifts in coral reefs under anthropogenic stress. , 2011, Ecology.

[50]  J. Rolfe,et al.  Factors affecting adoption of improved management practices in the pastoral industry in Great Barrier Reef catchments. , 2015, Journal of environmental management.

[51]  Scarla J. Weeks,et al.  Changes in water clarity in response to river discharges on the Great Barrier Reef continental shelf: 2002–2013 , 2016 .

[52]  Robert L. Pressey,et al.  Integrated Land-Sea Conservation Planning: The Missing Links , 2011 .

[53]  J. Foster,et al.  Trading Off Global Fuel Supply, CO2 Emissions and Sustainable Development , 2016, PloS one.

[54]  G. De’ath,et al.  HISTORICAL MARINE POPULATION ESTIMATES: TRIGGERS OR TARGETS FOR CONSERVATION? THE DUGONG CASE STUDY , 2005 .

[55]  R. Steneck,et al.  Rising to the challenge of sustaining coral reef resilience. , 2010, Trends in ecology & evolution.

[56]  Marcus Sheaves,et al.  The Great Barrier Reef World Heritage Area seagrasses: managing this iconic Australian ecosystem resource for the future , 2015 .

[57]  M. Rasheed,et al.  Declines of seagrasses in a tropical harbour, North Queensland, Australia, are not the result of a single event , 2015, Journal of Biosciences.

[58]  Glenn De'ath,et al.  Water quality as a regional driver of coral biodiversity and macroalgae on the Great Barrier Reef. , 2010, Ecological applications : a publication of the Ecological Society of America.

[59]  Rebecca Bartley,et al.  Informing policy to protect coastal coral reefs: insight from a global review of reducing agricultural pollution to coastal ecosystems. , 2014, Marine pollution bulletin.

[60]  J. Brodie,et al.  Land-sea connectivity, ecohydrology and holistic management of the Great Barrier Reef and its catchments: time for a change , 2016 .

[61]  J. Brodie,et al.  Management of Agriculture to Preserve Environmental Values of the Great Barrier Reef, Australia , 2015 .

[62]  Karen Vella,et al.  A method for risk analysis across governance systems: a Great Barrier Reef case study , 2013 .

[63]  Marc Hockings,et al.  Independent assessment of management effectiveness for the Great Barrier Reef: outlook report 2014 , 2014 .

[64]  Joleah B. Lamb,et al.  Reserves as tools for alleviating impacts of marine disease , 2016, Philosophical Transactions of the Royal Society B: Biological Sciences.

[65]  R. Pressey,et al.  Effective marine offsets for the Great Barrier Reef World Heritage Area , 2014 .

[66]  Hugh Sweatman,et al.  Adaptive management of the Great Barrier Reef: A globally significant demonstration of the benefits of networks of marine reserves , 2010, Proceedings of the National Academy of Sciences.

[67]  R. Pressey,et al.  Enhancing the Value and Validity of EIA: Serious Science to Protect Australia's Great Barrier Reef , 2016 .

[68]  D. Economics,et al.  Economic contribution of the Great Barrier Reef , 2013 .

[69]  Catherine J. Collier,et al.  Marine Monitoring Program: Inshore seagrass, annual report for the sampling period 1st June 2013 - 31st May 2014 , 2015 .

[70]  B. Tilbrook,et al.  The exposure of the Great Barrier Reef to ocean acidification , 2016, Nature Communications.

[71]  UNESCO/IUCN reactive monitoring mission report on the Great Barrier Reef , 2012 .

[72]  G. De’ath,et al.  Predicting the impact of present and future human land-use on the Great Barrier Reef , 2005 .

[73]  Christina C. Hicks,et al.  A framework for understanding climate change impacts on coral reef social–ecological systems , 2016, Regional Environmental Change.

[74]  A. Carter,et al.  Dynamics of a deep-water seagrass population on the Great Barrier Reef: annual occurrence and response to a major dredging program , 2015, Scientific Reports.

[75]  Dennis Normile,et al.  ECOLOGY. El Niño's warmth devastating reefs worldwide. , 2016, Science.

[76]  O. Hoegh‐Guldberg,et al.  Scientific Consensus Statement on Water Quality in the Great Barrier Reef , 2008 .

[77]  G. De’ath,et al.  The 27–year decline of coral cover on the Great Barrier Reef and its causes , 2012, Proceedings of the National Academy of Sciences.

[78]  J. Bruno,et al.  Shifting base-lines, declining coral cover, and the erosion of reef resilience: comment on Sweatman et al. (2011) , 2011, Coral Reefs.

[79]  J. Carstensen,et al.  Return to Neverland: Shifting Baselines Affect Eutrophication Restoration Targets , 2009 .

[80]  A. Hodgson,et al.  Condition, status and trends and projected futures of the dugong in the Northern Great Barrier Reef and Torres Strait; including identification and evaluation of the key threats and evaluation of available management options to improve its status. , 2007 .

[81]  D. Bellwood,et al.  Phase Shifts, Herbivory, and the Resilience of Coral Reefs to Climate Change , 2007, Current Biology.

[82]  James R.A. Butler,et al.  Future makers or future takers? A scenario analysis of climate change and the Great Barrier Reef , 2011 .

[83]  M. Rasheed,et al.  Contrasting recovery of shallow and deep water seagrass communities following climate associated losses in tropical north Queensland, Australia. , 2014, Marine pollution bulletin.

[84]  J. Christensen,et al.  Climate phenomena and their relevance for future regional climate change , 2013 .

[85]  Agus Santoso,et al.  Increased frequency of extreme La Niña events under greenhouse warming , 2015 .

[86]  G. Almany Marine Ecology: Reserve Networks Are Necessary, but Not Sufficient , 2015, Current Biology.

[87]  J. Tollefson 2015 declared the hottest year on record , 2016, Nature.

[88]  T. Done,et al.  Improved water quality can ameliorate effects of climate change on corals. , 2009, Ecological applications : a publication of the Ecological Society of America.

[89]  Jon Brodie,et al.  An assessment of residence times of land-sourced contaminants in the Great Barrier Reef lagoon and the implications for management and reef recovery. , 2012, Marine pollution bulletin.

[90]  J. Pandolfi,et al.  Projecting Coral Reef Futures Under Global Warming and Ocean Acidification , 2011, Science.

[91]  J. Brodie,et al.  Environmental triggers for primary outbreaks of crown-of-thorns starfish on the Great Barrier Reef, Australia. , 2015, Marine pollution bulletin.

[92]  Jamie Oliver,et al.  Operationalizing resilience for adaptive coral reef management under global environmental change , 2014, Global change biology.

[93]  M. Pratchett,et al.  Large predatory coral trout species unlikely to meet increasing energetic demands in a warming ocean , 2015, Scientific Reports.

[94]  F. Kroon,et al.  Ecologically based targets for bioavailable (reactive) nitrogen discharge from the drainage basins of the Wet Tropics region, Great Barrier Reef. , 2015, Marine pollution bulletin.

[95]  I. Bohnet,et al.  Terrestrial pollutant runoff to the Great Barrier Reef: An update of issues, priorities and management responses. , 2012, Marine pollution bulletin.

[96]  Ryan D R Turner,et al.  River loads of suspended solids, nitrogen, phosphorus and herbicides delivered to the Great Barrier Reef lagoon. , 2012, Marine pollution bulletin.

[97]  B. Houlden,et al.  Ecological risk assessment of the East Coast Otter Trawl Fishery in the Great Barrier Reef Marine Park: Data report , 2012 .

[98]  N. Stoeckl,et al.  The significance of environmental values for destination competitiveness and sustainable tourism strategy making: insights from Australia's Great Barrier Reef World Heritage Area , 2015 .

[99]  Jörg Wiedenmann,et al.  Impacts of nutrient enrichment on coral reefs: new perspectives and implications for coastal management and reef survival , 2014 .

[100]  G. De’ath,et al.  Establishing Representative No‐Take Areas in the Great Barrier Reef: Large‐Scale Implementation of Theory on Marine Protected Areas , 2005 .

[101]  David J. Pannell,et al.  Integrated assessment of public investment in land-use change to protect environmental assets in Australia , 2012 .

[102]  A. Roberts,et al.  Regulatory reform requirements to address diffuse source water quality problems in Australia: learning from US experiences , 2014 .

[103]  Marcus Sheaves,et al.  Expanding coastal urban and industrial seascape in the Great Barrier Reef World Heritage Area: Critical need for coordinated planning and policy , 2015 .

[104]  TORRES STRAIT DUGONG SANCTUARY Deepwater Seagrass Monitoring 2010 - 2014 , 2014 .